The rolling minyak jeung noda minyak lianna sésana dina beungeut foil nu, nu kabentuk dina beungeut foil ka varying derajat sanggeus annealing, disebut bintik minyak.
Alesan utama pikeun bintik minyak: tingkat luhur minyak dina aluminium foil rolling, atawa rentang distilasi teu pantes minyak rolling; infiltrasi minyak mékanis dina minyak rolling aluminium foil; prosés annealing teu bener; excessive oil on the surface of the product during rolling; The slitting tension is too large, causing the aluminum foil roll to be too tight.
